Electric ear-phone.



No. 849,353. PATENTED 1mm, 1907. `L. P. CLARKE.

ELECTRIC EAR PHONE.

APPLICATION FILED FBB.13, 1907.

f /0f j lil' T/JZLC,

UNITED STATES PATENT oEEIGE.

LEWIS F. CLARKE, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO GLOBE EAR` PHONECOMPANY, BOSTON, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

ELECTRIC EARPHONE Patented April 2, 1907.

Application filed February 13,1907. Serial No. 357,154.

To a/ZZ whom t may concern:

Be it known that I, LEwrs F. CLARKE, a citizen of the United States,residing at Boston, in the county of Suffolk and State of Massachusetts,have invented an Improvement in Electric Ear-Phones, of which thefollowing description, in connection with the accompanying drawings, isa specification, like letters on the drawings representing like parts.

, My invention aims to make more convenient the small pocket-telephonescommonly provided for deaf people. Such instruments when of thedetachable or separable construction have been heretofore commonlycumbersome and awkward and have required more or less mechanical skilland the use of tools, &c., to take them apart.

My invention, although relating to a Small detail, aims to make thisdelicate and essential instrument much more convenient for the averageuser, and to this end I place the contact-posts of the pocket-battery atthe upper end of the battery, so that the latter can readily slip intothe coat-pocket without inconvenience, and I provide at the back of thetransmitter a socket-containing terminal piece from which thecircuit-wires lead from the transmitter to the receiver. Thisarrangement enables the user to separate the battery and the rest of theapparatus instantly and readily whenever he desires to do so. Theconstruotional details of my invention will be pointed out withreference to the accompanying drawings, in which- Flgure 1 representsthe receiver and battery in edge or side view. Fig. 2 isa rear view ofthe transmitter, showing the terminal piece in section. Fig. 3 isafragmentary View, in rear elevation, of the battery and topcontact-posts; and Fig. 4 shows in front elevation the practicalapplication of my invention in use.

At the u per end of a suitable flat pocketbattery 1 providecontact-posts 2 3, having split spring-plu ends 4., the battery beingclosed small an compact, so as to fit down in the vest-pocket orcoat-pocket, as shown in Fig. 4. The transmitter 5 is provided at itsback with a terminal piece 6, preferably of insulating material,containinff threaded openings 7 8 for receiving threaded sockets 9,Whose shoulders 10 clamp in place circuitterminals 11 12 of a cable 13,which passes out from the terminal piece 6 at 14 and leads thence to areceiver 15, of usual or preferred kind.

By reason of my invention the transmitter may be readily disconnectedfrom the battery instantly without removing the battery from the pocketand may be replaced conveniently whenever required. The instrument,although capable of dismemberment in this manner, is exceedingly compactand neat in appearance, no contact-springs or attachments are requiredat the bottom or side of the battery, as heretofore, and in spite of thedetachable construction of the apparatus there i s nothing that can getout of order.

Having described my invention, what Il name to this specification in thepresence of two subscribing witnesses. g

LEWIS F. CLARKE. Witnesses:

GEO. H. MAXWELL, WM. J. PIKE.

